1. Department of Women’s and Children’s Health, Karolinska Institutet, Stockholm, Sweden
2. Sachs’ Children and Youth Hospital, Södersjukhuset, Stockholm, Sweden
3. Unit of Pediatrics, Institute of Clinical Sciences, University of Umeå, Umeå, Sweden
4. Department of Pediatrics, Institute of Clinical Sciences, The Queen Silvia Children's Hospital, University of Gothenburg, Gothenburg, Sweden
5. Department of Paediatrics, St Olavs Hospital, Trondheim, Norway
6. Department of Laboratory Medicine, Children’s and Women’s Health, Norwegian University of Science and Technology Trondheim, Trondheim, Norway
7. Karolinska University Hospital, Stockholm, Sweden
8. Department of Women’s and Children’s Health, Uppsala University, Uppsala, Sweden